Preheat oven to 425 degrees F.
In a small bowl, stir together first 4 ingredients (brown sugar through pepper).
Line a dish or rimmed baking sheet with foil or parchment for easy cleanup. Spray the dish or baking sheet with cooking spray.
Place pork on the prepared baking sheet. Pat dry with a paper towel.
Rub brown sugar mixture all over the pork.
Bake pork for 20-30 minutes, or until a thermometer reads 145 degrees F.
Remove from oven, tent with foil, and allow to rest for about 5 minutes before slicing and serving.
